Capital city abroad is large (7)

I believe the answer is:

algiers

I'm a little stuck... Click here to teach me more about this clue!

'capital city' is the definition.
'algiers' can be an answer for 'city' (Algiers is an example). I am not sure about the 'capital' bit.

'abroad is large' is the wordplay.
'abroad' is an anagram indicator (abroad can mean moving around).
'is'+'large'='islarge'
'islarge' is an anagram of 'ALGIERS'.

Can you help me to learn more?

(Other definitions for algiers that I've seen before include "Capital city" , "North African capital" , "N. African port" , "North African port" , "NW African capital" .)

I've seen this clue in The Telegraph.

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